New update is no help at all. I opened Safari and lost 2 % just by opening it.

Upgraded to 5.0.1 this morning. Still draining at the exact same rate. Unplugged with a full charge 2 1/2 hours ago, and already down to 80% with light usage. Just lost 2% during a 15 minute shower. I see no difference at all.

Same here. Updated about 1.5 hours ago, battery has drained 20% since then with no usage! This is awful!

Roughly the same numbers here.